Psychological Stress as a Determinant of Protein Levels and Salivary-Induced Aggregation of Streptococcus gordonii in Human Whole Saliva
作者:
Jos A. Bosch,
Henk S. Brand,
Toon J. M. Ligtenberg,
Bob Bermond,
Johan Hoogstraten,
Arie V. Nieuw Amerongen,
期刊:
Psychosomatic Medicine
(OVID Available online 1996)
卷期:
Volume 58,
issue 4
页码: 374-382
ISSN:0033-3174
年代: 1996
出版商: OVID
数据来源: OVID
摘要:
Several pathologies of the oral cavity have been associated with stress, so we investigated salivary-induced aggregation during psychological stress. In addition, salivary total protein, alpha-amylase, and secretory immunoglobulin A (s-IgA) were assessed. In this longitudinal study, 28 dental students provided unstimulated whole saliva during 10 minutes before an academic examination and subsequently 2 weeks and 6 weeks later in a nonstress situation. The effect of whole saliva on the aggregation of Streptococcus gordonii (HG 222) was determined spectrophotometrically. The results show a significant stress-mediated increase of salivary total protein concentration, alpha-amylase activity, amylase/protein ratio, alpha-amylase output, s-IgA concentration, and s-IgA output. There was also a trend for increased total protein output, whereas salivary flow rate was unchanged. The aggregation of S. gordonii in whole saliva collected before examination was 13.1%, whereas the aggregation in whole saliva collected during nonstress was 23.3%. This reduction was statistically significant (p <.01). Furthermore, the decrease in bacterial aggregation was related to the increase in state-anxiety (p <.05). The reduction in aggregation of S. gordonii under stress was not correlated with changes in salivary flow rate, s-IgA concentration, total protein concentration, or alpha-amylase activity. These results suggest that acute psychological stress exerts its influence on both salivary composition and salivary function. Reduced bacterial aggregation may be a contributing factor in the often reported relationship between stress and impaired oral health.
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